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How to Display All Users Who Liked On a Particular Blog in Social Media Android App?
  • Last Updated : 09 Apr, 2021

This is the Part 12 of “Build a Social Media App on Android Studio” tutorial, and we are going to cover the following functionalities in this article:

  • We are going to view the list of users who have like a particular blog.
  • After Click on total like we will be redirected to PostLikedBy.Activity.
  • In that, we will be using a recycler view to show the list of users who have liked a post.
  • We can also view the list of all users who likes our post from the PostDetailActivity.class.

Step By Step Implementation

Step 1: Working with the AdapterPosts.java file. Redirecting to PostLikedByActivity.class to view all the user’s list

holder.like.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent=new Intent(holder.itemView.getContext(), PostLikedByActivity.class);
                intent.putExtra("pid",pid);
                holder.itemView.getContext().startActivity(intent);
            }
        });

Below is the code for the AdapterPosts.java file.

Java




package com.example.socialmediaapp;
  
import android.app.ProgressDialog;
import android.content.Context;
import android.content.Intent;
import android.text.format.DateFormat;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.ImageButton;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.PopupMenu;
import android.widget.TextView;
import android.widget.Toast;
  
import androidx.annotation.NonNull;
import androidx.recyclerview.widget.RecyclerView;
  
import com.bumptech.glide.Glide;
import com.google.android.gms.tasks.OnFailureListener;
import com.google.android.gms.tasks.OnSuccessListener;
import com.google.firebase.auth.FirebaseAuth;
import com.google.firebase.database.DataSnapshot;
import com.google.firebase.database.DatabaseError;
import com.google.firebase.database.DatabaseReference;
import com.google.firebase.database.FirebaseDatabase;
import com.google.firebase.database.Query;
import com.google.firebase.database.ValueEventListener;
import com.google.firebase.storage.FirebaseStorage;
import com.google.firebase.storage.StorageReference;
  
import java.util.Calendar;
import java.util.List;
import java.util.Locale;
  
public class AdapterPosts extends RecyclerView.Adapter<com.example.socialmediaapp.AdapterPosts.MyHolder> {
  
    Context context;
    String myuid;
    private DatabaseReference liekeref, postref;
    boolean mprocesslike = false;
  
    public AdapterPosts(Context context, List<ModelPost> modelPosts) {
        this.context = context;
        this.modelPosts = modelPosts;
        myuid = FirebaseAuth.getInstance().getCurrentUser().getUid();
        liekeref = FirebaseDatabase.getInstance().getReference().child("Likes");
        postref = FirebaseDatabase.getInstance().getReference().child("Posts");
    }
  
    List<ModelPost> modelPosts;
  
    @NonNull
    @Override
    public MyHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        View view = LayoutInflater.from(context).inflate(R.layout.row_posts, parent, false);
        return new MyHolder(view);
    }
  
    @Override
    public void onBindViewHolder(@NonNull final MyHolder holder, final int position) {
        final String uid = modelPosts.get(position).getUid();
        String nameh = modelPosts.get(position).getUname();
        final String titlee = modelPosts.get(position).getTitle();
        final String descri = modelPosts.get(position).getDescription();
        final String ptime = modelPosts.get(position).getPtime();
        String dp = modelPosts.get(position).getUdp();
        String plike = modelPosts.get(position).getPlike();
        final String image = modelPosts.get(position).getUimage();
        String email = modelPosts.get(position).getUemail();
        String comm = modelPosts.get(position).getPcomments();
        final String pid = modelPosts.get(position).getPtime();
        Calendar calendar = Calendar.getInstance(Locale.ENGLISH);
        calendar.setTimeInMillis(Long.parseLong(ptime));
        String timedate = DateFormat.format("dd/MM/yyyy hh:mm aa", calendar).toString();
        holder.name.setText(nameh);
        holder.title.setText(titlee);
        holder.description.setText(descri);
        holder.time.setText(timedate);
        holder.like.setText(plike + " Likes");
        holder.comments.setText(comm + " Comments");
        setLikes(holder, ptime);
        try {
            Glide.with(context).load(dp).into(holder.picture);
        } catch (Exception e) {
  
        }
        holder.image.setVisibility(View.VISIBLE);
        try {
            Glide.with(context).load(image).into(holder.image);
        } catch (Exception e) {
  
        }
  
        holder.like.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent = new Intent(holder.itemView.getContext(), PostLikedByActivity.class);
                intent.putExtra("pid", pid);
                holder.itemView.getContext().startActivity(intent);
            }
        });
  
        holder.likebtn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                final int plike = Integer.parseInt(modelPosts.get(position).getPlike());
                mprocesslike = true;
                final String postid = modelPosts.get(position).getPtime();
                liekeref.addValueEventListener(new ValueEventListener() {
                    @Override
                    public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
                        if (mprocesslike) {
                            if (dataSnapshot.child(postid).hasChild(myuid)) {
                                postref.child(postid).child("plike").setValue("" + (plike - 1));
                                liekeref.child(postid).child(myuid).removeValue();
                                mprocesslike = false;
                            } else {
                                postref.child(postid).child("plike").setValue("" + (plike + 1));
                                liekeref.child(postid).child(myuid).setValue("Liked");
                                mprocesslike = false;
                            }
                        }
                    }
  
                    @Override
                    public void onCancelled(@NonNull DatabaseError databaseError) {
  
                    }
                });
            }
        });
  
        holder.more.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                showMoreOptions(holder.more, uid, myuid, ptime, image);
            }
        });
  
  
        holder.comment.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent = new Intent(context, PostDetailsActivity.class);
                intent.putExtra("pid", ptime);
                context.startActivity(intent);
            }
        });
    }
  
    private void showMoreOptions(ImageButton more, String uid, String myuid, final String pid, final String image) {
        PopupMenu popupMenu = new PopupMenu(context, more, Gravity.END);
        if (uid.equals(myuid)) {
            popupMenu.getMenu().add(Menu.NONE, 0, 0, "DELETE");
        }
        popupMenu.setOnMenuItemClickListener(new PopupMenu.OnMenuItemClickListener() {
            @Override
            public boolean onMenuItemClick(MenuItem item) {
                if (item.getItemId() == 0) {
                    deltewithImage(pid, image);
                }
  
                return false;
            }
        });
        popupMenu.show();
    }
  
    private void deltewithImage(final String pid, String image) {
        final ProgressDialog pd = new ProgressDialog(context);
        pd.setMessage("Deleting");
        StorageReference picref = FirebaseStorage.getInstance().getReferenceFromUrl(image);
        picref.delete().addOnSuccessListener(new OnSuccessListener<Void>() {
            @Override
            public void onSuccess(Void aVoid) {
                Query query = FirebaseDatabase.getInstance().getReference("Posts").orderByChild("ptime").equalTo(pid);
                query.addValueEventListener(new ValueEventListener() {
                    @Override
                    public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
                        for (DataSnapshot dataSnapshot1 : dataSnapshot.getChildren()) {
                            dataSnapshot1.getRef().removeValue();
                        }
                        pd.dismiss();
                        Toast.makeText(context, "Deleted Sucessfully", Toast.LENGTH_LONG).show();
                    }
  
                    @Override
                    public void onCancelled(@NonNull DatabaseError databaseError) {
  
                    }
                });
            }
        }).addOnFailureListener(new OnFailureListener() {
            @Override
            public void onFailure(@NonNull Exception e) {
  
            }
        });
    }
  
    private void setLikes(final MyHolder holder, final String pid) {
        liekeref.addValueEventListener(new ValueEventListener() {
            @Override
            public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
                if (dataSnapshot.child(pid).hasChild(myuid)) {
                    holder.likebtn.setCompoundDrawablesWithIntrinsicBounds(R.drawable.ic_liked, 0, 0, 0);
                    holder.likebtn.setText("Liked");
                } else {
                    holder.likebtn.setCompoundDrawablesWithIntrinsicBounds(R.drawable.ic_like, 0, 0, 0);
                    holder.likebtn.setText("Like");
                }
            }
  
            @Override
            public void onCancelled(@NonNull DatabaseError databaseError) {
  
            }
        });
    }
  
    @Override
    public int getItemCount() {
        return modelPosts.size();
    }
  
    class MyHolder extends RecyclerView.ViewHolder {
        ImageView picture, image;
        TextView name, time, title, description, like, comments;
        ImageButton more;
        Button likebtn, comment;
        LinearLayout profile;
  
        public MyHolder(@NonNull View itemView) {
            super(itemView);
            picture = itemView.findViewById(R.id.picturetv);
            image = itemView.findViewById(R.id.pimagetv);
            name = itemView.findViewById(R.id.unametv);
            time = itemView.findViewById(R.id.utimetv);
            more = itemView.findViewById(R.id.morebtn);
            title = itemView.findViewById(R.id.ptitletv);
            description = itemView.findViewById(R.id.descript);
            like = itemView.findViewById(R.id.plikeb);
            comments = itemView.findViewById(R.id.pcommentco);
            likebtn = itemView.findViewById(R.id.like);
            comment = itemView.findViewById(R.id.comment);
            profile = itemView.findViewById(R.id.profilelayout);
        }
    }
}

Step 2: Working with the PostDetailsActivity.java file. Add this line to view all users from click on total likes in PostdeatilsActivity.



  like.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent=new Intent(PostDetailsActivity.this, PostLikedByActivity.class);
                intent.putExtra("pid",postId);
                startActivity(intent);
            }
        });

Below is the code for the PostDetailsActivity.java file.

Java




package com.example.socialmediaapp;
  
import android.app.ProgressDialog;
import android.content.Intent;
import android.os.Bundle;
import android.text.TextUtils;
import android.text.format.DateFormat;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageButton;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.TextView;
import android.widget.Toast;
  
import androidx.annotation.NonNull;
import androidx.appcompat.app.ActionBar;
import androidx.appcompat.app.AppCompatActivity;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
  
import com.bumptech.glide.Glide;
import com.google.android.gms.tasks.OnFailureListener;
import com.google.android.gms.tasks.OnSuccessListener;
import com.google.firebase.auth.FirebaseAuth;
import com.google.firebase.database.DataSnapshot;
import com.google.firebase.database.DatabaseError;
import com.google.firebase.database.DatabaseReference;
import com.google.firebase.database.FirebaseDatabase;
import com.google.firebase.database.Query;
import com.google.firebase.database.ValueEventListener;
  
import java.util.ArrayList;
import java.util.Calendar;
import java.util.HashMap;
import java.util.List;
import java.util.Locale;
  
public class PostDetailsActivity extends AppCompatActivity {
  
  
    String hisuid, ptime, myuid, myname, myemail, mydp, uimage, postId, plike, hisdp, hisname;
    ImageView picture, image;
    TextView name, time, title, description, like, tcomment;
    ImageButton more;
    Button likebtn, share;
    LinearLayout profile;
    EditText comment;
    ImageButton sendb;
    RecyclerView recyclerView;
    List<ModelComment> commentList;
    AdapterComment adapterComment;
    ImageView imagep;
    boolean mlike = false;
    ActionBar actionBar;
    ProgressDialog progressDialog;
  
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_post_details);
        actionBar = getSupportActionBar();
        actionBar.setTitle("Post Details");
        actionBar.setDisplayHomeAsUpEnabled(true);
        actionBar.setDisplayShowHomeEnabled(true);
        postId = getIntent().getStringExtra("pid");
        recyclerView = findViewById(R.id.recyclecomment);
        picture = findViewById(R.id.pictureco);
        image = findViewById(R.id.pimagetvco);
        name = findViewById(R.id.unameco);
        time = findViewById(R.id.utimeco);
        more = findViewById(R.id.morebtn);
        title = findViewById(R.id.ptitleco);
        myemail = FirebaseAuth.getInstance().getCurrentUser().getEmail();
        myuid = FirebaseAuth.getInstance().getCurrentUser().getUid();
        description = findViewById(R.id.descriptco);
        tcomment = findViewById(R.id.pcommenttv);
        like = findViewById(R.id.plikebco);
        likebtn = findViewById(R.id.like);
        comment = findViewById(R.id.typecommet);
        sendb = findViewById(R.id.sendcomment);
        imagep = findViewById(R.id.commentimge);
        share = findViewById(R.id.share);
        profile = findViewById(R.id.profilelayout);
        progressDialog = new ProgressDialog(this);
        loadPostInfo();
  
        loadUserInfo();
        setLikes();
        actionBar.setSubtitle("SignedInAs:" + myemail);
        loadComments();
        sendb.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                postComment();
            }
        });
        likebtn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                likepost();
            }
        });
        like.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent = new Intent(PostDetailsActivity.this, PostLikedByActivity.class);
                intent.putExtra("pid", postId);
                startActivity(intent);
            }
        });
    }
  
    private void loadComments() {
  
        LinearLayoutManager layoutManager = new LinearLayoutManager(getApplicationContext());
        recyclerView.setLayoutManager(layoutManager);
        commentList = new ArrayList<>();
        DatabaseReference reference = FirebaseDatabase.getInstance().getReference("Posts").child(postId).child("Comments");
        reference.addValueEventListener(new ValueEventListener() {
            @Override
            public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
                commentList.clear();
                for (DataSnapshot dataSnapshot1 : dataSnapshot.getChildren()) {
                    ModelComment modelComment = dataSnapshot1.getValue(ModelComment.class);
                    commentList.add(modelComment);
                    adapterComment = new AdapterComment(getApplicationContext(), commentList, myuid, postId);
                    recyclerView.setAdapter(adapterComment);
                }
            }
  
            @Override
            public void onCancelled(@NonNull DatabaseError databaseError) {
  
            }
        });
    }
  
    private void setLikes() {
        final DatabaseReference liekeref = FirebaseDatabase.getInstance().getReference().child("Likes");
        liekeref.addValueEventListener(new ValueEventListener() {
            @Override
            public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
  
                if (dataSnapshot.child(postId).hasChild(myuid)) {
                    likebtn.setCompoundDrawablesWithIntrinsicBounds(R.drawable.ic_liked, 0, 0, 0);
                    likebtn.setText("Liked");
                } else {
                    likebtn.setCompoundDrawablesWithIntrinsicBounds(R.drawable.ic_like, 0, 0, 0);
                    likebtn.setText("Like");
                }
            }
  
            @Override
            public void onCancelled(@NonNull DatabaseError databaseError) {
  
            }
        });
    }
  
    private void likepost() {
  
        mlike = true;
        final DatabaseReference liekeref = FirebaseDatabase.getInstance().getReference().child("Likes");
        final DatabaseReference postref = FirebaseDatabase.getInstance().getReference().child("Posts");
        liekeref.addValueEventListener(new ValueEventListener() {
            @Override
            public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
  
                if (mlike) {
                    if (dataSnapshot.child(postId).hasChild(myuid)) {
                        postref.child(postId).child("plike").setValue("" + (Integer.parseInt(plike) - 1));
                        liekeref.child(postId).child(myuid).removeValue();
                        mlike = false;
  
                    } else {
                        postref.child(postId).child("plike").setValue("" + (Integer.parseInt(plike) + 1));
                        liekeref.child(postId).child(myuid).setValue("Liked");
                        mlike = false;
                    }
                }
            }
  
            @Override
            public void onCancelled(@NonNull DatabaseError databaseError) {
  
            }
        });
    }
  
    private void postComment() {
        progressDialog.setMessage("Adding Comment");
  
        final String commentss = comment.getText().toString().trim();
        if (TextUtils.isEmpty(commentss)) {
            Toast.makeText(PostDetailsActivity.this, "Empty comment", Toast.LENGTH_LONG).show();
            return;
        }
        progressDialog.show();
        String timestamp = String.valueOf(System.currentTimeMillis());
        DatabaseReference datarf = FirebaseDatabase.getInstance().getReference("Posts").child(postId).child("Comments");
        HashMap<String, Object> hashMap = new HashMap<>();
        hashMap.put("cId", timestamp);
        hashMap.put("comment", commentss);
        hashMap.put("ptime", timestamp);
        hashMap.put("uid", myuid);
        hashMap.put("uemail", myemail);
        hashMap.put("udp", mydp);
        hashMap.put("uname", myname);
        datarf.child(timestamp).setValue(hashMap).addOnSuccessListener(new OnSuccessListener<Void>() {
            @Override
            public void onSuccess(Void aVoid) {
                progressDialog.dismiss();
                Toast.makeText(PostDetailsActivity.this, "Added", Toast.LENGTH_LONG).show();
                comment.setText("");
                updatecommetcount();
            }
        }).addOnFailureListener(new OnFailureListener() {
            @Override
            public void onFailure(@NonNull Exception e) {
                progressDialog.dismiss();
                Toast.makeText(PostDetailsActivity.this, "Failed", Toast.LENGTH_LONG).show();
            }
        });
    }
  
    boolean count = false;
  
    private void updatecommetcount() {
        count = true;
        final DatabaseReference reference = FirebaseDatabase.getInstance().getReference("Posts").child(postId);
        reference.addListenerForSingleValueEvent(new ValueEventListener() {
            @Override
            public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
                if (count) {
                    String comments = "" + dataSnapshot.child("pcomments").getValue();
                    int newcomment = Integer.parseInt(comments) + 1;
                    reference.child("pcomments").setValue("" + newcomment);
                    count = false;
  
                }
            }
  
            @Override
            public void onCancelled(@NonNull DatabaseError databaseError) {
  
            }
        });
    }
  
    private void loadUserInfo() {
  
        Query myref = FirebaseDatabase.getInstance().getReference("Users");
        myref.orderByChild("uid").equalTo(myuid).addListenerForSingleValueEvent(new ValueEventListener() {
            @Override
            public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
                for (DataSnapshot dataSnapshot1 : dataSnapshot.getChildren()) {
                    myname = dataSnapshot1.child("name").getValue().toString();
                    mydp = dataSnapshot1.child("image").getValue().toString();
                    try {
                        Glide.with(PostDetailsActivity.this).load(mydp).into(imagep);
                    } catch (Exception e) {
  
                    }
                }
            }
  
            @Override
            public void onCancelled(@NonNull DatabaseError databaseError) {
  
            }
        });
    }
  
    private void loadPostInfo() {
  
        DatabaseReference databaseReference = FirebaseDatabase.getInstance().getReference("Posts");
        Query query = databaseReference.orderByChild("ptime").equalTo(postId);
        query.addValueEventListener(new ValueEventListener() {
            @Override
            public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
  
                for (DataSnapshot dataSnapshot1 : dataSnapshot.getChildren()) {
                    String ptitle = dataSnapshot1.child("title").getValue().toString();
                    String descriptions = dataSnapshot1.child("description").getValue().toString();
                    uimage = dataSnapshot1.child("uimage").getValue().toString();
                    hisdp = dataSnapshot1.child("udp").getValue().toString();
                    // hisuid = dataSnapshot1.child("uid").getValue().toString();
                    String uemail = dataSnapshot1.child("uemail").getValue().toString();
                    hisname = dataSnapshot1.child("uname").getValue().toString();
                    ptime = dataSnapshot1.child("ptime").getValue().toString();
                    plike = dataSnapshot1.child("plike").getValue().toString();
                    String commentcount = dataSnapshot1.child("pcomments").getValue().toString();
                    Calendar calendar = Calendar.getInstance(Locale.ENGLISH);
                    calendar.setTimeInMillis(Long.parseLong(ptime));
                    String timedate = DateFormat.format("dd/MM/yyyy hh:mm aa", calendar).toString();
                    name.setText(hisname);
                    title.setText(ptitle);
                    description.setText(descriptions);
                    like.setText(plike + " Likes");
                    time.setText(timedate);
                    tcomment.setText(commentcount + " Comments");
                    if (uimage.equals("noImage")) {
                        image.setVisibility(View.GONE);
                    } else {
                        image.setVisibility(View.VISIBLE);
                        try {
                            Glide.with(PostDetailsActivity.this).load(uimage).into(image);
                        } catch (Exception e) {
  
                        }
                    }
                    try {
                        Glide.with(PostDetailsActivity.this).load(hisdp).into(picture);
                    } catch (Exception e) {
  
                    }
  
  
                }
            }
  
            @Override
            public void onCancelled(@NonNull DatabaseError databaseError) {
  
            }
        });
    }
  
    @Override
    public boolean onSupportNavigateUp() {
        onBackPressed();
        return super.onSupportNavigateUp();
    }
  
}

Step 3: Working with the PostLikedByActivity Activity

Working with the activity_postlikedby.xml file

Navigate to the app > res > layout > activity_postlikedby.xml and add the below code to that file. Below is the code for the activity_postlikedby.xml file. 

XML




<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".PostLikedByActivity">
  
    <androidx.recyclerview.widget.RecyclerView
        android:id="@+id/likerecycle"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:layoutManager="androidx.recyclerview.widget.LinearLayoutManager"
        tools:listitem="@layout/row_users" />
      
</RelativeLayout>

Working with the PostLikedByActivity.java file

Go to the PostLikedByActivity.java file and refer to the following code. Below is the code for the PostLikedByActivity.java file.

Java




package com.example.socialmediaapp;
  
import android.content.Intent;
import android.os.Bundle;
  
import androidx.annotation.NonNull;
import androidx.appcompat.app.ActionBar;
import androidx.appcompat.app.AppCompatActivity;
import androidx.recyclerview.widget.RecyclerView;
  
import com.google.firebase.auth.FirebaseAuth;
import com.google.firebase.database.DataSnapshot;
import com.google.firebase.database.DatabaseError;
import com.google.firebase.database.DatabaseReference;
import com.google.firebase.database.FirebaseDatabase;
import com.google.firebase.database.ValueEventListener;
  
import java.util.ArrayList;
import java.util.List;
  
public class PostLikedByActivity extends AppCompatActivity {
  
    RecyclerView recyclerView;
    String postId;
    List<ModelUsers> list;
    AdapterUsers adapterUsers;
    FirebaseAuth firebaseAuth;
  
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_post_liked_by);
  
        ActionBar actionBar = getSupportActionBar();
        actionBar.setTitle("Post Liked By");
        actionBar.setDisplayHomeAsUpEnabled(true);
        actionBar.setDisplayShowHomeEnabled(true);
        firebaseAuth = FirebaseAuth.getInstance();
        actionBar.setSubtitle(firebaseAuth.getCurrentUser().getEmail());
        recyclerView = findViewById(R.id.likerecycle);
        Intent intent = getIntent();
        postId = intent.getStringExtra("pid");
  
        list = new ArrayList<>();
  
        DatabaseReference reference = FirebaseDatabase.getInstance().getReference("Likes");
        reference.child(postId).addValueEventListener(new ValueEventListener() {
            @Override
            public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
                list.clear();
                for (DataSnapshot dataSnapshot1 : dataSnapshot.getChildren()) {
                    String hisUid = "" + dataSnapshot1.getRef().getKey();
                    getUsers(hisUid);
                }
            }
  
            @Override
            public void onCancelled(@NonNull DatabaseError databaseError) {
  
            }
        });
    }
  
    private void getUsers(String hisUid) {
        DatabaseReference databaseReference = FirebaseDatabase.getInstance().getReference("Users");
        databaseReference.orderByChild("uid").equalTo(hisUid).addValueEventListener(new ValueEventListener() {
            @Override
            public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
  
                for (DataSnapshot ds : dataSnapshot.getChildren()) {
                    ModelUsers model = ds.getValue(ModelUsers.class);
                    list.add(model);
                }
                adapterUsers = new AdapterUsers(PostLikedByActivity.this, list);
                recyclerView.setAdapter(adapterUsers);
            }
  
            @Override
            public void onCancelled(@NonNull DatabaseError databaseError) {
  
            }
        });
    }
  
    @Override
    public boolean onSupportNavigateUp() {
        onBackPressed();
        return super.onSupportNavigateUp();
    }
}

Output:

For all the drawable file used in this article please refer to this link: https://drive.google.com/drive/folders/1M_knOH_ugCuwSP5nkYzeD4dRp-Honzbe?usp=sharing

Below is the file structure after performing these operations:

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